求助...

具体就是计算两个数相乘...代码运行，虽然能得出结果，但是要先崩溃一次才能得出结果...这个...谁能帮我我看看呀~~~

Activity03Activity.java
package chong.Activity03;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
/*
* 1、在activity03中声明四个控件
* 2、为其中的两个控件设置显示的值
* 3、创建一个易做图类，监听按钮按下的动作
* 4、将易做图类的对象绑定在按钮对象上
*/
public class Activity03Activity extends Activity {
    /** Called when the activity is first created. */

private EditText factorOne;
private EditText factorTwo;
private TextView symbol;
private Button calculate;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //根据控件的id来取得代表控件的对象
        factorOne = (EditText)findViewById(R.id.factorOne);
        factorTwo = (EditText)findViewById(R.id.factorTwo);
        symbol = (TextView)findViewById(R.id.symbol);
        calculate = (Button)findViewById(R.id.calculate);
        //为symbol和calculate设置显示的值
//        symbol.setText("乘以");
//        calculate.setText("计算");
        symbol.setText(R.string.symbol);
        calculate.setText(R.string.calculate);
        //绑定易做图   于  calculate对象上
        calculate.setOnClickListener(new CalculateListener());

    }
    //内部类可以使用外部类的成员变量和函数 “内部类”
    class CalculateListener implements OnClickListener{

@Override
public void onClick(View v) {
/*
* 取得两个edittext的值
* 将这两个值存放到intent对象当中
* 使用这个intent对象来启动resultactivity
*/
String factorOneStr=factorOne.getText().toString();
String factorTwoStr=factorTwo.getText().toString();

Intent intent = new Intent();
intent.putExtra("one", factorOneStr);
intent.putExtra("two", factorTwoStr);
intent.setClass(Activity03Activity.this, ResultActivity.class);
Activity03Activity.this.startActivity(intent);
}

    }
}

ResultActivity.java

package chong.Activity03;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

/*
* 1、接受从activity03中所传递的值
* 2、计算两个值的积
* 3、将计算的结果显示在activity上
*/
public class ResultActivity extends Activity {

private TextView resultView;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.result);
resultView = (TextView)findViewById(R.id.result);
Intent intent = getIntent();

String factorOneStr = intent.getStringExtra("one");
String factorTwoStr = intent.getStringExtra("two");
int factorOneInt = Integer.parseInt(factorOneStr);
int factorTwoInt = Integer.parseInt(factorTwoStr);
int result ;
result = factorOneInt * factorTwoInt;
resultView.setText(result+"");

}

}

main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

<EditText

    android:id="@+id/factorOne"
    android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />

    <TextView
        android:id="@+id/symbol"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello"
       />
    <EditText

    android:id="@+id/factorTwo"
    android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
    <Button
        android:id="@+id/calculate"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />


</LinearLayout>

result.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/result"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
         />

</LinearLayout>

string.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, Activity03Activity!</string>
    <string name="app_name">Activity03</string>
    <string name="resultLable">result</string>
<string name="symbol">乘以</string>
<string name="calculate">计算</string>

</resources> --------------------编程问答-------------------- 崩溃是logcat输出日志是什么呢

补充：移动开发 ,  Android